Re-order imports in Python tests to avoid crashing (facebookresearch#3806)

Summary:
Pull Request resolved: facebookresearch#3806

No explanation for why this works but importing faiss prior to torch causing Python to crash on certain test cases under pytest. This is a temporary workaround with a full RCA required.

Reviewed By: pankajsingh88

Differential Revision: D61956515

fbshipit-source-id: d33992d0b92e87d58ddff1f160990cba487b9927

Author: ramilbakhshyiev

tests/torch_test_contrib.py

@@ -3,10 +3,10 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-import faiss
 import torch
 import unittest
 import numpy as np
+import faiss
 import faiss.contrib.torch_utils
 
 class TestTorchUtilsCPU(unittest.TestCase):

tests/torch_test_neural_net.py

@@ -3,11 +3,11 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-import faiss
 import torch
 from torch import nn
 import unittest
 import numpy as np
+import faiss
 
 from faiss.contrib import datasets
 from faiss.contrib.inspect_tools import get_additive_quantizer_codebooks